Can imenu be made to rescan every time?

Question

Is it possible to make imenu refresh on every access, and to remove the *Rescan* item from the menu?

Answer 1

This makes the rescan item an empty string, maybe that's good enough.

(setq imenu-auto-rescan t
      imenu-auto-rescan-maxout (* 1024 1024)
      imenu--rescan-item '("" . -99))

Here's some advice on some internal imenu functions that actually removes the rescan item. I think I got the corner cases, but it might break in the future.

(defun jpk/imenu-no-rescan-item (ret)
  (when (and imenu-auto-rescan (<= (buffer-size) imenu-auto-rescan-maxout))
    (setq ret (delq imenu--rescan-item ret)))
  ret)
(advice-add 'imenu--make-index-alist :filter-return #'jpk/imenu-no-rescan-item)
(advice-add 'imenu--split-menu :filter-return #'jpk/imenu-no-rescan-item)

You should make a bug report to get a proper fix in. It seems silly to have the rescan item if auto rescan is enabled.